Cisco CME T1/E1 PRI configuration and Troubleshooting

It is a basic guide for install and configuring T1/E1 module on Cisco Unified Call manager Express(CME). Also, it will have some troubleshooting tips and notes.

Notes; Cisco ISR Router 29xx platform, Cisco VWIC3-1MFT-T1/E1 module

Install T1/E1 module

Step 1. Power down the Cisco 29xx router

Step 2. Insert VWIC3-IMFT-T1/E1 module into the router; In this case slot 0 and subslot 0.

Step 3. Power on the Cisco 29xx router

Configuring T1/E1 module

Step 4. Activate the T1/E1 module

Router(config)# card type e 0 0
* It might be required to reload the router for the configuration change to be effective.
* This command has to apply first. If not, below commands won’t be taken.
* Controller status will be changed to ‘up’

Step 5. Configuring Network clock for timings

Router(config)# network-clock-participate wic 0
Router(config)# network-clock-select 1 E1 0/0/0 ; “E1” must be uppercase.
* Network clock source transitioned from priority 10 to priority 1

Step 6. Enable the ISDN switch type as Primary-net5 globally

Router(config)#isdn switch-type primary-net5

Step 7. Controller E1 and PRI group timeslot configuration.(Ex, Configuring the timeslot 1~31 for voice call to a specific service provider network)

Router(config)# controller e1 0/0/0
Router(config-controller)# pri-group timeshots 1 – 31
* All the channel will be state to up immediately.
– framing no-CRC4
-clock source internal

Warning message? If not enough DSP resources
% Not enough DSP resources available to configure pri-group on controller E1 0/0/0
% The remaining dsp resources are enough for 24 time slots.
% For current codec complexity, 1 extra  dsp(s) are required to create this voice port.

You can adjust slot by 1-24.

** For the T1 Framing:ESF, Code: B8Zs
*** For T1 timeslot

Router(config-controller)# pri-group timeshots 1 – 24

Step 8. Create Serial interface for the PRI group and configure the D channel serial interface

E1

Router(config)# interface Serial0/0/0:15
Router(config-if)# no ip address
Router(config-if)# encapsulation hdlc
Router(config-if)# isdn switch-type primary-net5
Router(config-if)# isdn incoming-voice voice
Router(config-if)# no cdp enable
Router(config-if)# exit
* isdn bchan-number-order ascending
* isdn sending-complete

Router(config)# voice-port 0/0/0:15
Router(config-voiceport)# no shutdown
* no vad
* no comfort-noise

T1

Router(config)# interface Serial0/0/0:23
Router(config-if)# no ip address
Router(config-if)# encapsulation hdlc
Router(config-if)# isdn switch-type primary-net5
Router(config-if)# isdn incoming-voice voice
Router(config-if)# no cdp enable
Router(config-if)# no fair-queue

Router(config)# voice-port 0/0/0:15
Router(config-voiceport)# no shutdown
* no vad
* no comfort-noise

* For T1, 24th channel will be B-channel out of 24 channel(0~23): 0/0/0:23
** For E1, 16th channel will be B-channel out of first 16 channel(0~15): 0/0/0:15

Verifying T1/E1 module installation

Step 9. Status check

Router# show isdn status
Router# show isdn active
Router# show isdn service
Router# show controllers e1 or t1
Router# show interface serial0/0/0:15

Step 10. Dial peer

dial-peer voice 911 pots
description 911 outbound via PRI T1/E1
destination-pattern 911
port 0/0/0:15 <–E1
or
port 0/0/0:23 <–T1

dial-peer voice 2 pots
description Any call from the PRI matching 2222
incoming called-number 2222
direct-inward-dial

dial-peer voice 3 pots
description Any call from the PRI matching 3333
incoming called-number 3333
direct-inward-dial

dial-peer voice 2222 pots
description Local ext. 2222 of FXS card
destination-pattern 2222
port 0/1/0

dial-peer voice 3333 pots
description Local ext. 3333 of FXS card
destination-pattern 3333
port 0/1/1

Step 11. Translate and dial-peer

Troubleshooting T1/E1 module

Step 12. Troubleshooting

a. Ensure the the framing, line coding,  and clock source are configured correctly. Apply below command to check a status

Router# show controller t1
* Ensure no error on the interface

Router# show isda status

b. Ensure Layer 1 is in the ACTIVE state; Layer 1 should be always ACTIVE unless the T1/E1 is down.

c. If you see, Layer 1 is DEACTIVATED; there is an issue on physical connectivity of the T1/E1 circuit.

d. Ensure Layer2 is in the MULTIPLE_FRAME_ESTABLISHED state; If Layer2 is not in the MULTIPLE_FRAME_ESTABLISHED state, use debug isdn q921 command to troubleshoot.

Step 13. more to come

Ref.

http://www.cisco.com/c/en/us/support/docs/wan/t1-e1-t3-e3/8131-T1-pri.html